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Concentration terms (molarity, molality, mole fraction, ppm) and dilution
NEET level
Single correct option
Difficulty 1 of 3
mc076
A solution contains
46
g
of ethanol (
46
g/mol
) and
36
g
of water (
18
g/mol
). The mole fraction of ethanol is
A
0.667
B
0.333
C
0.561
D
0.500
Answer: B
Ethanol = 46/46 = 1 mol; water = 36/18 = 2 mol. Mole fraction of ethanol = 1/(1+2) = 0.333.
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